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I am kind of curious to hear your opinions for the problem of Duplicated Content linked with White Label for the two following scenarios :

1) For example booking.com, they also offer full white label (not hosted on booking.com : http://hotel.aegeanair.com/)
all their hotels are duplicated here. Is this not clearly a big issue for booking.com ?

2) Still in the travel industry, some websites use one single 'White label' URL such as partner.example.com/$id/
Even if the white label are slightly different from the original website, the products are the same so there is a problem of DP ?
would the rel=cannonical tag work here ?